Here talk only about 2017, as that was his year, and no one of years before. On my post from 8 Dec2017, can see that BTC NEVER down less than 50% Fibonacci correction,. again in 2017 only, because BTC start to have big attention only since 2Q 2017 up.
17.12.2017 trend turn down on risky speed between 0.25 and 0.382 Fibo, with spike to 11,159.93 . which so near 61.8% Fibo Correction. than recover his position to 17,234.99 break 1/1 and bring hope for next epic number rally to 25,000$ as was predicted by major crypto persons.
Than all movement can see. This graph cant help as in pass, because cant build it before, but relying on this Fibo lines, support and resistance+Pivots, at least can see the hopeless and hopeful range

@mortonpeak, I think USA news made big effect with fresh news. Like rehabilitation for everyone. They dump it, to let big guys come to btc at low, now will pump to let another hamster FOMO bring more cash in, to let btc grow up again. All this game for billionaires and millionaires, but simply people lose money in CFD, of just sale on panic.